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Finding the Fourth Proportional to 217.20, 300.12 and 158.88

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Solution

The fourth proportional to 217.20, 300.12 and 158.88 is: 219.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.20 : 300.12 = 158.88 : x
  2. Step 2: Convert to fraction form
    217.20/300.12 = 158.88/x
  3. Step 3: Cross multiply
    217.20x = 300.12 × 158.88
  4. Step 4: Simplify right side
    217.20x = 47,683.07
  5. Step 5: Solve for x
    x = 47,683.07/217.20
  6. Step 6: Final answer
    x = 219.54

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.